Why is the summer in Beijing hotter than that in Shanghai? Besides the small specific heat of drying, what are the reasons?

In recent years, why is it always hotter in summer in Beijing than in Shanghai? There are other reasons besides that Beijing is relatively dry and its specific heat capacity is relatively small. Let's have a look.

Geographically, Beijing is north and Shanghai is south. Therefore, geographically speaking, there are some differences between Shanghai and Beijing. However, compared with the south, there are fewer rainy days in summer in the north, and the weather is dry in April, May and June. At this time, Beijing is hot because of its small specific heat capacity, and the temperature difference between day and night is a bit large. Compared with Shanghai, in recent decades, the average temperature in Beijing in May, June and February is mostly higher than that in Shanghai, and the summer time is obviously longer than that in Shanghai. But usually in July and August, relatively speaking, it is a little hotter in the south.

Let's imagine that June is usually the rainy season in the south, but compared with the north, the north is relatively dry at this time. In July and August, summer drought days began to appear in the south, and some areas in the north began to enter the flood season, but the flood season in Beijing was relatively short, so the summer in Beijing was often hot. If there is little precipitation in summer in Beijing, relatively speaking, there will be less rainfall in a year in Beijing. But the average annual precipitation it brings is usually caused by several heavy rains. Therefore, the long flood season in Beijing hardly exists. On the other hand, Shanghai is often in the rainy season. As a region in the south, summer is very humid. Therefore, summer in Beijing is often hotter than that in Shanghai.

Let's look at the factors that affect the temperature in a city.

The first is the latitude of the region, which is the objective reason of a city. Because different cities are at different latitudes, if the latitudes are different, the temperature difference is quite large. There are also some objective reasons. Different regions have different atmospheric movements due to different land and sea distributions, which is also one of the factors that affect the temperature of a city. There are also human factors, first of all, air pollution in cities. In a city, automobile exhaust emissions, industrial production and human activities may produce a lot of carbon dioxide, dust and other substances, and these substances will absorb the thermal radiation in the environment, thus affecting the temperature. Another human factor is the natural underlying surface of the city. If a city's building squares increase substantially, then relatively speaking, natural factors such as green plants and water bodies will also decrease accordingly. Generally speaking, more heat energy is released than absorbed, which will also cause the temperature of a city to rise.

This is Bian Xiao's introduction about city temperature.